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Finding the Fourth Proportional to 113.18, 169.78 and 52.31

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Solution

The fourth proportional to 113.18, 169.78 and 52.31 is: 78.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.18 : 169.78 = 52.31 : x
  2. Step 2: Convert to fraction form
    113.18/169.78 = 52.31/x
  3. Step 3: Cross multiply
    113.18x = 169.78 × 52.31
  4. Step 4: Simplify right side
    113.18x = 8,881.49
  5. Step 5: Solve for x
    x = 8,881.49/113.18
  6. Step 6: Final answer
    x = 78.48

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.